How can I fix my Rangemaster Toledo 90 electric cooker?

I have a Rangemaster Toledo 90 all electric. It suddenly went off this evening, all display/timer lights gone, no ovens or hob working. After turning off wall switch for a while, grill, main oven and four rings (all left hand side over main oven) are now working ok but right hand small oven and large ring over this are not. Display/timer lights still not working either. It is a relatively new cooker, working since Nov '07